@ducnut... Have you noticed braking issues with your Silverado and larger wheels? Do you have trailer brakes? I've got an '04 Avalanche w/20" wheels (personal truck) and even without pulling a trailer I can tell a big difference in braking between the factory 16" and the 20"s. The last tandem axle trailer we purchased, I picked it up with the Avalanche and I don't have a brake controller either, and it was pushing me down the road. The trailer is a 6.5'x16'. I have ended up putting slotted rotors on the truck and it makes a difference, I've thought about upgrading the calipers, but the truck is almost 10 years old and 125k.
Just wondering if you experience any issues or notice a difference with the larger wheels and brake fade or anything.